Abstract
Abstract The disposal of dairy plant processing wastewater in a three‐stage aerated lagoon system was evaluated over a one‐year period. Aerators were fixed on the lagoon surfaces and designed to mechanically supply oxygen to the system. Monitored pollution parameters included flow‐rate, biochemical oxygen demand (BOD), chemical oxygen demand (COD), total suspended solids (TSS), total solids (TS), and pH. Microbiological parameters studied were heterotrophic plate count (HPC) and adenosine triphosphate (ATP) as measured by relative light units (RLU). The average daily effluent flow‐rate from the lagoon system was 163.3 x 103 L/d with 7 mg/L BOD5, 122 mg/L COD, 31 mg/L TSS, 652 mg/L TS, and 7.69 pH of effluent. An average BOD removal of 97% was achieved from the first lagoon sampling point to final pffluent, with 89% removal of COD, 93% removal of TSS, and 49% removal of TS. Overall, BOD was strongly correlated with the COD, TSS, TS, and pH. Also, COD showed a significant correlation with TSS and TS. Anothe...
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